[AT] Allis Chalmers B Question

[Recentjester at aol.com]

It has not run in many years pulled manifold full of rust. I  need to check 
the compression. It had some to let me know I was com'in up on #1.  I have 
another mag but cannot see the dog earred tooth at all. 
 
 
In a message dated 4/2/2011 6:33:31 A.M. Central Daylight Time,  
jtchall at nc.rr.com writes:

I  haven't followed all of this thread so I'll add my $.02 with apologies  
regarding any info that I am repeating. You mention the plugs are firing,  
that is no sign the mag is hot enough. Any magneto should be able to fire  
the spark across a 1/4" gap. That is considered a minimum--a lot of  
"newer" 
mags can hold 3/8-7/16 of spark. Take an old spark plug and open  up the 
spark gap wide (no more than a 1/4"--try in increments of 1/16")  can and 
see 
if the mag can jump that gap.
I missed your original post  so I am not certain about what suggestions to 
throw out. Is this a running  tractor that now refuses to crank or is this 
a 
machine that has been taken  all apart for a rebuild. If it was a running 
machine, I'd just think you  have lost fire or fuel, can't see it being 
much 
else unless it has been  sitting for many years and the compression is low. 
If it is a rebuild  project, the list of re-assembly errors is long.
If you don't get it  cranked, re-post some background info on the machine 
(I've already dumped  the old posts).

Good Luck,
John Hall

----- Original Message  ----- 
From: <Recentjester at aol.com>
To:  <at at lists.antique-tractor.com>
Sent: Saturday, April 02, 2011 12:11  AM
Subject: Re: [AT] Allis Chalmers B Question


> plug is dry  it is overhead valve an it is pullin a vacumn on  my hand at
> the  carb throat. gas is runnin out the carb. Valves are all moving   
fine.
> grounded plug with it out of the hole nice blue spark (an on all  the  
rest 
> as
> they go around, I checked them all) I am on  compression stroke felt  the
> pressure an both intake and exhaust  are both closed on #1 #4 is on 
> exhaust.  not
> even a pop  an tried ether.
>
>
> In a message dated 4/1/2011 5:33:31  P.M. Central Daylight Time,
> 1cdevill at gmail.com writes:
>
>  On Fri,  Apr 1, 2011 at 4:33 PM,  <Recentjester at aol.com>  wrote:
>>  Welllll I been crankin this allis B to no avail. I  even tried  ether no
> pop
>> even. The mag is set so that  It clicks on #1 while the FIRE line  is  in
> the
>>  middle of the timing hole on the flywheel. fireing  order is correct  
>> vales
>> are set correctly 0.10 loose have gas to  carb  an its clean. I have 
never
>> cranked  one before an  must confess I  am maybe erring on the side of
>  caution.
>> Have an old  Harlie an  have been  kicked.
>
>
> Back to basics my friend.
>
>  Remove #1  plug.  Is it wet or dry??
> Wet- No spark or just  flooded.
> Dry- find  out why fuel is not drawing into the  cylinder.
>
> Ground the plug base and  crank the engine to  verify spark at the plug 
> tip.
>
> Disable the other   three plugs.  Crank the engine with finger on #1
> plug hole until  you  feel compression building.  Make sure mag snaps at
> the  top of that  stroke to confirm it is not 180 degrees out.
>
>  Good luck.
>
> Charlie   V.
>
>
>>
>>

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